; 注释: .ll文件中注释以';'开头
; ModuleID = 'easy.c'
source_filename = "easy.c"
; 注释: target的开始
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; 注释: target的结束

define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  ;创建浮点数a地址
  %2 = alloca float, align 4
  store i32 0, i32* %1, align 4
  ;给浮点数赋值, 5.555在计算机浮点数表示为0x40163851E0000000
  ;5.555的单精度浮点数应该是0x40B1C28F，但我只有输入双精度浮点数的结果才能正常计算
  ;难道llvm中float是双精度的？
  store float 0x40163851E0000000, float* %2, align 4
  %3 = load float, float* %2, align 4;存入寄存器
  ;得到比较结果
  %4 = fcmp ogt float %3, 1.000000e+00
  ;根据比较结果跳转
  br i1 %4, label %5, label %6

5:;存233
  store i32 233, i32* %1, align 4
  br label %7

6:;存0
  store i32 0, i32* %1, align 4
  br label %7

7:;返回 
  %8 = load i32, i32* %1, align 4
  ret i32 %8
}

attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.module.flags = !{!0}
!llvm.ident = !{!1}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{!"clang version 10.0.1 "}